Framework for Multiple Time-Scale Cascaded MPC Application in Power Systems

Abstract: A framework for the application of cascaded Model predictive control (MPC) in power systems for controlling processes on multiple time-scales is presented. Power system control and optimisation is traditionally accomplished on time-scales ranging from milliseconds (protection systems, primary voltage and frequency control) to several years (grid expansion planning). Employing an MPC scheme for controlling or optimising power system properties over several time-scales is in general computationally prohibitive. Instead, separate MPC schemes can be implemented, each designed for one time-scale, working in parallel on the same or different tasks, acting on separate time-scales and interacting via updates of each others ’ constraints and cost terms. The resulting cascaded MPC scheme remains computationally tractable. Its operational principles are illustrated by simulation examples